The simmering revolt in the Bundestag makes it almost impossible for Mrs Merkel to offer real concessions at Tuesday’s emergency summit with French president Nicolas Sarkozy.
“We are categorical that the FDP-group will not vote for eurobonds. Everybody must understand that there is no working majority for this,” said Frank Schäffler, the finance spokesman for the Free Democrats (FDP).
Oliver Luksic, the FDP’s Saarland chief, told Bild Zeitung the survival of Germany’s coalition was now rests on the handling of this issue. “Eurobonds are a sweet poison that leads to more debt, rather than less. Should the government endorse a common European bond and with it take the final step towards a long-term debt union, the FDP should seriously ask whether the coalition has any future.”

Alexander Dobrindt, general-secretary of Bavaria’s Social Christians (CSU) and a key Merkel ally, said his party has issued a “crystal clear ‘No’ to eurobonds”.
Chancellor Merkel also faces mutinous grumbling among her own Christian Democrats (CDU), though the party’s policy elite is willing to consider partial eurobonds up to the Maastricht limit of 60pc of GDP but only under stringent conditions.